when the CBlCS ratio ia grsatar than 1. AV1 in 121 i s larger than the mnventiond AV, in (11. The CBCS ratio is about LO in praelioe. For the mndition AV* AV, the new cell -raga fapaeitanes is snavgh to be abovt 314 that af the mnvintianal cell ( see Fig.2 1 . Thus the density of the FEC cell b-m~a~ullygrraterthenthatafthc2-alsmentcel l . thatisfactorof 1.6( m T a b l e 1 ).ThismaksstheFECcellsvlfableforhighd~ruityDRAM~.